Lyric text is set in upright (roman) type, never italic, and in a distinct font/size from tempo and expression markings

Sung text is always upright roman type, never italic (italic is reserved for expression markings), and conventionally a slightly different size/weight from expression text so the eye can distinguish sung text from a performance instruction at a glance.

Gould (lyrics set upright); Read.

This rule is about where marks land on the page, so it can only be judged after engraving. Collision and spacing faults live here.